UKKO--The engine that you posted the plans for should actually be a good model for a beginner. Go ahead--build it. Start a thread on here about the build, take lots of pictures of your progress, and don't be shy about asking questions. There are some amazingly talented people on this forum who will help you. I was raised on the imperial (inch) system and although I had to start using the metric system when I was about 25 years old, I have never been really comfortable with it. (Canada went metric about 1970) I understand your reluctance to use drawings full of "alien" measurements.---Brian